linux-kernel - Re: [Update][PATCH] PCI / PM: Disable runtime PM of PCIe ports

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Message-ID: <CAC=cRTNfUkgYzC-+tOw8hyP8k3qRd6jRU67NA7PwXpHNL+2c2A@mail.gmail.com>
Date:	Tue, 2 Apr 2013 13:34:35 +0800
From:	huang ying <huang.ying.caritas@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Martin Mokrejs <mmokrejs@...d.natur.cuni.cz>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Zheng Yan <zheng.z.yan@...el.com>,
	Huang Ying <ying.huang@...el.com>
Subject: Re: [Update][PATCH] PCI / PM: Disable runtime PM of PCIe ports

Hi, Bjorn,

On Tue, Apr 2, 2013 at 4:53 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Mon, Apr 1, 2013 at 2:51 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>> On Monday, April 01, 2013 11:34:46 AM Bjorn Helgaas wrote:
>>> [+cc Zheng, who added this with 71a83bd727]
>>>
>>> On Sat, Mar 30, 2013 at 4:38 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
>>> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>> >
>>> > The runtime PM of PCIe ports turns out to be quite fragile, as in
>>> > some cases things work while in some other cases they don't and we
>>> > don't seem to have a good way to determine whether or not they are
>>> > going to work in advance.
>>>
>>> Do you have any references to problems encountered when enabling
>>> runtime PM for PCIe ports?  That information will be useful to anybody
>>> who wants to take another crack at getting this working.
>>
>> Well, bug 53811 is one example and problems recently reported by
>> Martin are another.  Do you want me to dig deeper?
>
> OK, I got this one:
>
>   https://bugzilla.kernel.org/show_bug.cgi?id=53811
>
> Martin has reported a lot of problems lately, and I don't know which
> are related to runtime PM for PCIe ports.  I was hoping for a couple
> URLs to put in the changelog so that when somebody gets the itch to
> make this work, they have some useful info to start from.  If you
> point me at a specific message, I'll dig up an archive URL for it.
>
> Otherwise, I'm afraid we'll just oscillate between "enable PM, find
> bug, disable PM, enable PM, find same bug, disable PM, etc..."

Sorry for late!  I am trying to fix a way to fix 53811 and Martin's
bug without disable PM for port totally.

Best Regards,
Huang Ying
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